Email validation
Email syntax
Catch malformed addresses before sending. A correctly formatted address is only the first check; it does not establish that the mailbox exists.
PRE-SEND EMAIL & SMS PROTECTION
Protect your reputation.
Before you send.
Catch risky email addresses, check your sender setup and validate phone numbers before your messages go out. Sendvio brings these checks into your campaigns and automated follow-ups.
EMAIL ADDRESS VERIFICATION
Catch email problems before they become bounces.
Protect the audience you have worked to build. Sendvio checks email addresses before sending, using separate validation infrastructure to help protect your sending reputation during verification.
Domain & SMTP
Domain statusCheck
Receiving serverCheck
Mailbox responseCheck
Receiving server
Domain & SMTP validation
Check for invalid, inactive or parked domains and invalid email accounts. Evaluate the receiving server’s response before attempting delivery.
Incoming email route
Recipient domain→
MX records→
Receiving mail server✓
Mail routing
MX records & receiving servers
Verify the domain’s mail routing records and whether a mail server is configured to accept incoming email. A website can exist without a working email service.
Before delivery
Mailbox responseChecked
Permanent failureDetected
Contact statusInvalid
Mailbox verification
Hard-bounce detection
Check whether a mailbox exists and can receive email. Detecting permanent failures in advance helps keep avoidable bounces out of your campaigns.
Temporary inbox
Address typeDisposable
Risk signalFlagged
Review before sending→
Contact quality
Disposable addresses
Identify temporary inboxes that can disappear shortly after signup. These addresses are unreliable for an ongoing relationship with your customers.
Sender protection
Address risk signalsChecked
Spam-trap riskFlagged
Review before sending→
Risk detection
Spam-trap risk
Detect addresses associated with spam-trap risk. Sending to these addresses can damage the reputation that supports delivery to your genuine customers.
Catch-all detection
Server accepts addresses✓
Individual mailboxUnconfirmed
Catch-all signalReview
Domain behavior
Catch-all domains
Identify servers that accept any address at a domain. That response does not establish whether a particular person’s inbox exists.
Contact hygiene
Duplicate addresses
Detect repeated email addresses to avoid processing or messaging the same address more than once.
EMAIL AUTHENTICATION & SENDER REPUTATION
Authenticate your domain and protect your sender reputation.
A valid recipient is only part of email deliverability. Your domain configuration, sending history and content matter too. Sendvio brings these protections into the same platform.
yourbrand.comSender authentication
SPF✓DKIM✓DMARC✓
Sender identity
Authentication alignment before sending
Sendvio checks domain authentication alignment before email campaigns and automations, helping you identify sender configuration problems before they affect your messages.
Authentication records
Duplicate DMARCDetect
Multiple SPF entriesCombine
Configuration issuesGuidance
Domain configuration
Clear guidance for domain records
Detect duplicate DMARC records, generate a combined SPF record for multiple email platforms and get steps to resolve configuration issues.
Adaptive sending volumeIllustrative
Sending reputation
Automated warming & rewarming
Build or resume email sending gradually. Sendvio adjusts sending volume automatically to support your domain’s sending reputation.
✓ Content length✓ Image splitting
Message preparation
Email content checks
Identify excessive email length and split oversized images into smaller sections. Address content and layout issues before sending your campaign.
SMS PHONE NUMBER VALIDATION
Check the phone line before sending a text.
A number saved in a customer profile may belong to a mobile phone or a landline. Sendvio checks the line type before SMS sending to help avoid attempts to phones that cannot receive text messages.
Line type
MobileSMS-capable line
LandlineIdentified before sending
SMS validation
Mobile or landline?
Identify the type of phone number on the customer record. A number that works for voice calls is not necessarily suitable for an SMS campaign or automation.
Before the SMS
Phone numberCheck
Line typeLandline
SMS suitabilityReview
Pre-send checks
Fewer avoidable SMS failures
Detect landline numbers before attempting to send a text. This helps reduce unnecessary attempts to destinations that cannot receive SMS.
Validation result
ChannelSMS
Invalid numberMarked
Customer recordRetained
Contact record
Validation stays with the contact
Phone numbers found to be invalid are marked in your Sendvio database, keeping the result connected to the customer record.
Channel-specific checks
EmailAddress & domain
SMSPhone line type
Before sending✓
Channel protection
Part of your SMS workflow
Phone validation is included in the Email + SMS plan. It checks the phone number for SMS sending; email domain and mailbox checks apply separately to email.
PART OF THE SENDING WORKFLOW
Protection that supports every campaign and follow-up.
Check the audience and sending setup before a campaign or automated follow-up goes out. Email and SMS protections address different problems, with validation results kept on the customer record for future sends.
Your sending audience
Customer dataCurrent
Subscription statusChecked
Relevant segmentSelected
Audience preparation
Prepare the audience
Use current customer data, subscription status and relevant segments. Verification complements good audience practices; it does not replace permission to send.
Review each channel
Email addressCheck
Sender authenticationCheck
SMS line typeCheck
Pre-send protection
Check before sending
For email, check recipient addresses and sender authentication. For SMS, assess number suitability and line type. Keep each channel’s result distinct.
Keep the result
Invalid contactMarked
Validation resultSaved
Future sendsUse result
Ongoing protection
Carry the result forward
Invalid addresses and numbers are marked in the database rather than deleted. Use those results to avoid repeating preventable sending attempts.
DELIVERABILITY QUESTIONS
Understand what the checks tell you.
What is a hard bounce?
A hard bounce is a permanent delivery failure, such as a nonexistent mailbox. Pre-send verification helps identify these problems before your campaign encounters them. Temporary failures, such as an unavailable receiving server, can still occur later.
Does a catch-all result mean an address is invalid?
No. A catch-all server accepts addresses at its domain without confirming that each individual mailbox exists. It is a risk signal, not proof that every address on that domain is invalid.
Does email verification guarantee inbox placement?
No. Address verification reduces avoidable bounces, while authentication and warming support your email reputation. Inbox placement also depends on recipient engagement, content and the receiving provider’s filtering.
Does a mobile number guarantee SMS delivery?
No. A mobile line type alone does not confirm current reachability. Carrier filtering and network conditions can still affect SMS delivery.
Are invalid contacts deleted?
Invalid email addresses and phone numbers are marked as invalid in your Sendvio contact database.